A spiral bevel gear is a bevel gear with helical teeth. The main application of this is in a vehicle differential, where the direction of drive from the drive shaft must be turned 90 degrees to drive the wheels. The helical design produces less vibration and noise than conventional straight-cut or spur-cut gear with straight teeth.

Spiral bevel gears are typically made from hardened steel. The teeth of these gears are usually ground for a more precise finish allowing for little noise at high speeds. You can specify left hand or right hand depending on the direction you need to run the gears.